Good day
I have a CPU load problem on a 2610. The router has a X21 Serial
interface and Ethernet, and does simple WAN routing. As the amount of
traffic increases, the CPU load increases as well, and when the
throughput is around 1.2Mbit at about 2000 packet/s, the CPU is
running so high that the box becomes unresponsive. This router is
theory supposed to be capable of doing 7.68Mbps at 15,000 pps.
I've checked that the router isn't doing processor switching, and as
far as I can see the vast majority of the traffic is being fast
switched, yet I seem to be hitting the documented performance limits
for process switching.
If I have to replace the router I can, but would like to know why I'm
running into trouble when the current router is supposedly well within
it's limits.
The box is running 12.3(9), but I've had the same issue on a 12.1
version. Below is the output of 'show interfaces stat' and 'show
interface switching' .
Any ideas/help is appreciated.
---
# sh int stat
Ethernet0/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 97 10200 219 17650
Route cache 760678 57144419 626362 47003211
Total 760775 57154619 626581 47020861
Serial0/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 467 37390 337 43569
Route cache 626497 40745693 760817 49520393
Total 626964 40783083 761154 49563962
-----
#sh int switching
Ethernet0/0
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 3524 Drops 0
Protocol IP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 3577 283416 3699 340458
Cache misses 96 - - -
Fast 20283972 1524355199 16554208 1236628784
Auton/SSE 0 0 0 0
Protocol ARP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 44 2640 4328 259680
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol CDP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 435 178350 435 133110
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 869 46926 2601 156060
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
NOTE: all counts are cumulative and reset only after a reload.
Serial0/0
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 5209 Drops 0
Protocol IP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 17620 1589429 13114 1548222
Cache misses 14327 - - -
Fast 16555485 1071171389 20287359 1321039479
Auton/SSE 0 0 0 0
Protocol CDP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 429 137280 437 122797
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 1 14 238 3784
Cache misses 0 - - -
Fast 2750 44000 0 0
Auton/SSE 0 0 0 0
NOTE: all counts are cumulative and reset only after a reload.
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